We are now down to four competitors. The “o” in the middle of “Ordovician” was tricky, the broadcasters said, but Sarvadnya spelled it with ease and cruised through to the next round.

From early Earth to future Mars Mosses made the transition to land 450 million years ago during the Ordovician period, a process that Hamberger suspects couldn't have succeeded without some teamwork.

Statistical analyses across hundreds of species revealed that bird wing and leg proportions evolve independently and accommodate divergent ecological tasks. By contrast, bat limbs evolve in unison ...